Dry colloid-like indigo and process of making same.



loiddili AZER ECHT ECHMIDT, Q1? H5CHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO FAIRB- WER-KE VGRFI, MEISTER LUCIUS &, BB'G'NING, OF Hi'lCHST-ON-THE-MAIN, GEIL name, A GOB?OEATICN or GERMANY.

DRY GDLLOID-LIKE INDIGO AND PROCESS OF MAKING SAME.

Lil-383321.

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vided that when put under the microscope no crystals be discerned; indeed under oi such a power necessary rlliT'E'i'CifibilQllll, only circular Zles can be discerned. 'i'. have made the no srration that the said properties are not. changed by drying the magmas or the pa stes thus olitained from colloid-like indigo, at a lower or higher temperature. This anrpriaing fact, because other colbodies do not generally retain their propert ihen dried. The very great facility whichv the said bodies can be ch mically reduced is also fully maintained. This; observation permits of an extraordinary technical ad ance, since it is thus possible to obtain solid products of high percentage, which. are better adapted. for the trade than the other indigoes, and which very much resemble natural indigo and are therefore more salable than any other form of synihetic indigo, racially in unpivilized c! intries Where natural indigo with its char act risiic external pr V perties is stilliin great demand and synthetic indigo is rejected, In preparing 'th. products it is advantageous to add some diluent such, for instance, glucose, kaolin, etcv 4 i li .3 A colloidlike indigiivi aste of rengaih, oliataimid acmru'ng to s 1' described in ll. S. applications led 11th Aug. 1910 or Ser.

, .or in- "Z'FUS and 627759, filed tier. No. il i'lj l h filed rd Aug. lll is driul in an evaporating pun in wa m-0, or in the open air at a moderate temperature or at a higher temperature n a g. the weliknown Hziillard apparatus Specification of Letters Patent.

l i i l Patented Apr. 1, 1913.

iipplication filed July 9, 1812. Serial No. 708,481.

The granulated product obtained in either of the beforementioned ways very easily moistened with water; when put on the tongue it adheres to it firmly like natural indigo; when triturated with water it yields a blue liquid of an entirely pigment-like character, extremely easily reducible in the cold sugarwat,

Example ll: 15 5g. ofa paste of colloid' like indigo of about 34% strength is ground with about 4 kg. of grape-sugar (or any other additional substance) and about 4 kg. of chinaclay, advantagepusly while adding some caustic-soda lye. The thick magma thus obtained is further concentrated or allowed to directly dry into pieces at ordinary or a raised temperature. If the paste is of sup-h concentration in be plastic, it can be molded into piccee which can be completely dried. V

'lhe new phycical form of synthetic indigo is broadly claimed in my application Ser. No 576MB, filed 'Al'ignst 11, 1910. The new product in the form of lumps is claimed in, my application Ser. No. 577,200, filed August 15, 1910.

Having now described I claim, is: v

1, The process of preparing dry, colloidlike indigo having properties like natural indigo, which consists in bringing to dryness a paste of colloid-like indigo.

2. The prot of preparing dry, colloidlike indigo having properties like natural indigo, which. consists in bringing to dryness a paste of colloid-like indigp to which has been added a diluting dividing agent.

The process of preparing dry, colloidlike indigo having properties like natural indigo, which consists in bringin to dryness, in vac-a0, a paste of colloid-1i e indigo.

4. The process of preparing dry colloid like indigo having pro erties like natural indigo, which consists in bringing to dryness, in "/14. w a paste of colloid-like indigo to which hm:v men added a diluting dividing agent. I

As a new article of manufacturepdry colloid like indigo having the appearance of natural indigo, capable of being easily rednced of, slightly alkaline reducing agents, very readily moistened by water, firmly adher-i in the tonfi'ue like natural indigo and yielding when triturated with water, a blue when triturated with water, a. blue liquid of 10 liquid vn pigment-like character. pigment-like character. i

in new article of manufacture dry In testimony whereof, I afiix my signacoll'qiddike indigo in the fqrm of a powder, ture in presence of two witnesses.

'5 than pearance. of natural indigo i cap'db eofeasily reduced b slightly ALBRECHT SCHMIDT alkaline reducing 11 cuts, ve rea ily mois- Witnesses; tened by water, rmly ailhering to the JEAN GBUND,

tongue like natural indigd and yielding CARL GRUND. 

